Stainless Steel Common Machinable Grades

These are our stainless steel common machinable grades we use at Dynamic Die & Steel. We may have other materials not listed here but this will give you a guide of our popular materials.

 

Incoloy Iron-Based Superalloys

A-286

Incoloy 800

Incoloy 801

Incoloy 825

Incoloy 925

Inconel

 

Nickel-Based Superalloys

Inconel 600

Inconel 601

Inconel 617

Inconel 625

Inconel 690

Inconel 693

Inconel 718

Inconel 722

Inconel 725

Inconel X-750

Inconel 783

Hastelloy C-22

Hastelloy C-276

Hastelloy X

Hastelloy B-2

Hastelloy B-3

Hastelloy G-30

Monel 400

Monel K-500

Nimonic 75

Nimonic 80A

Nimonic 90

René 41

René 80

Waspaloy

Haynes 188

Haynes 230

Haynes 242

Haynes 263

Haynes 556

Inconel 625

 

Cobalt-Based Superalloys

Stellite 6

Stellite 21

Stellite 31

Haynes 25 (L-605)

Haynes 188

Mar-M 509

Cobalt Based Superalloys

 

Austenitic

301

302

303

304

304L

304H

309

310

310S

316

316L

316H

317

317L

321

347

Austenitic

 

Ferritic

409

410S

430

434

436

Martensitic

403

410

414

416

420

420F

422

431

440A

440B

440C

Duplex / Super Duplex

2101

2205

2304

2507

Zeron 100

Precipitation Hardening

13-8 PH

15-5 PH

17-4 PH

Special Grades

904L

Nitronic 50

Nitronic 60

 

 

Stainless Steel Common Machinable Grades

 

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A–Z CNC Machinable Materials

CNC (Computer Numerical Control) machining can process a vast array of materials, broadly categorised into metals, plastics, and sometimes composites or ceramics. The optimal material choice is always dictated by the final part’s required performance, environment, and budget.

 

ABS (plastic)

Acetal (POM / Delrin)

Aluminium (all grades)

Alloy Steels

Acrylic (PMMA)

Bakelite

Basswood

Brass (CZ121, CZ108, etc.)

Bronze (phosphor, aluminium, manganese)

Carbon Steel

Carbon Fibre Sheet

Cast Iron (grey, ductile)

Copper (C101, C110)

Delrin (Acetal / POM)

Duplex Stainless Steel

Epoxy Tooling Board

Engineering Plastics (general)

Fibreglass (G10 / FR4)

Foam Board (modelmaking)

Glass-Filled Nylon

Graphite (electrodes, tooling)

Hardened Tool Steel

HDPE (High-Density Polyethylene)

Inconel

Impact-Resistant Polymers (general)

Kovar

Kevlar Composites

Low-Carbon Steel

Leaded Brass

Magnesium

Mild Steel

Molybdenum

Medical-Grade Plastics

Nylon (PA6 / PA66 / PA12)

Nitriding Steels

O1 Tool Steel (and other oil-hardening steels)

PE (Polyethylene)

Polypropylene (PP)

PTFE (Teflon)

Quench & Tempered Steels

Rigid PVC

Stainless Steel (See second page for list )

Superalloys ( see 2nd list  I)

Titanium (Grade 2, Grade 5)

Tool Steels (D2, H13, O1, etc.)

UHMWPE

Urethane (machinable tooling board)

Vespel

Vinyl Plastics

Wood (hardwoods & softwoods)

Waspaloy

Xylan-Coated Metals (secondary machining)

Yellow Metals (general term for brass/bronze alloys)

Metals are the cornerstone of CNC, offering superior strength, durability, and conductivity.

 

Aluminium Alloys (e.g., 6061, 7075): The most common choice. Aluminium is prized for its excellent machinability, high strength-to-weight ratio, and natural corrosion resistance, making it ideal for aerospace and automotive parts.

 

Stainless Steel (e.g., 304, 316): Selected for its exceptional corrosion resistance, high strength, and aesthetic finish, particularly in medical and food processing applications. Certain grades, like 303, are specifically formulated for better machinability.

 

Brass and Copper: Excellent for components requiring high electrical and thermal conductivity, such as electrical contacts and heat sinks. Brass is known for its outstanding machinability, often leading to reduced cycle times.

 

Titanium Alloys (e.g., Ti-6Al-4V): Reserved for demanding, high-performance applications due to its incredible strength-to-weight ratio and biocompatibility, despite being more challenging and costly to machine.

 

Plastics are chosen for their light weight, electrical insulation, and chemical resistance.

 

Understanding the material’s machinability, strength, and cost is critical for successful CNC manufacturing.

 

Understanding the Machinability Index

The Machinability Index (or Machinability Rating) is a comparative measure of how easily a material can be cut. It is expressed as a percentage (%) relative to a standardised reference material. The Machinability Index is a vital tool for manufacturers to quickly estimate the production time and cost associated with machining a new part.

 

For any information on Stainless Steel Common Machinable Grades email us today.

 

For more information on Stainless Steel Common Machinable Grades talk to Dynamic Die and Steel